离心泵转子-轴承系统临界转速的数值研究

为了使离心泵在运行时能远离临界转速,需要对离心泵转子-轴承系统进行合理设计。利用有限元软件ANSYS建立了离心泵转子-轴承系统模型,计算了该转子-轴承系统的临界转速,分析了支承刚度和支承间距对临界转速的影响。结果表明:相对其他轴段,支承之间的轴段长度对临界转速有明显影响;支承间距和支承刚度的增加都能明显提高转子系统的前2阶临界转速。

Numerical Research on Centrifugal Pump Rotor-bearing System Critical Speed

In order to make the centrifugal pump get out of the critical speed in the runtime,it is necessary to design centrifugal pump rotor-bearing system reasonably.In this paper,a model for centrifugal pump rotor-bearing system was created based on ANSYS.The critical speeds of the rotorbearing system were calculated,and the effect of support stiffnesses and spans on the critical speeds was discussed.The results show that the length of the shaft section between bearings has more obvious influence on critical speed than the other shaft sections.The increase of both support span and support stiffness can increase the first two critical speeds obviously.